Chimneys aren’t built to withstand the heat of a creosote fire without significant damage. It is critical that you have your fireplace inspected after a chimney fire. During the inspection, a chimney sweep will check your chimney for damage, and clean it out if necessary.
Creosote expands during a chimney fire and will wholly or partially block your chimney. Your chimney will not be able, and you shouldn’t use your chimney until a professional chimney sweep has inspected it.